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3 years ago

Evaluate 18 - 5x when x = -7

Mathematics

1 answer:

sukhopar [10]3 years ago

3 0

Answer:

i thinks its -53

Step-by-step explanation:

18-5x

5x-7= -35

-35-18

-53

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nikdorinn [45]

Sum of the terms of the series is

Sn = n/2 ( a1+an )

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3 years ago

Triangle PQR is a right triangle. if PQ= 8 , what is PR?

Norma-Jean [14]

It is 30-60-90 triangle, so:

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Answer B.

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3 years ago

√3×sinx+cosx=0 tmf nghiệm

Crazy boy [7]

Answer:

x= -30

Step-by-step explanation:

√3×sinx+cosx=0

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2 years ago

What is the maximum height of of Anna's golf ball? The equation is y=x−0.04x2.

elena-s [515]

Given:

The height of a golf ball is represented by the equation:

$y=x-0.04x^2$

To find:

The maximum height of of Anna's golf ball.

Solution:

We have,

$y=x-0.04x^2$

Differentiate with respect to x.

$y'=1-0.04(2x)$

$y'=1-0.08x$

For critical values, $y'=0$ .

$1-0.08x=0$

$-0.08x=-1$

$x=\dfrac{-1}{-0.08}$

$x=12.5$

Differentiate y' with respect to x.

$y''=(0)-0.08(1)$

$y''=-0.08$

Since double derivative is negative, the function is maximum at $x=12.5$ .

Substitute $x=12.5$ in the given equation to get the maximum height.

$y=(12.5)-0.04(12.5)^2$

$y=12.5-0.04(156.25)$

$y=12.5-6.25$

$y=6.25$

Therefore, the maximum height of of Anna's golf ball is 6.25 units.

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3 years ago

Evaluate 18 - 5x when x = -7​

Evaluate 18 - 5x when x = -7